Product DetailsOptimal Diopter: 5 diopter is ideal for reading, sewing, knitting, crocheting, beading, welding, etc. 5 diopter means the maximum is 2.25 times the length of the object or 5 times the surface of the object. Distance between object and lens: 20 cm.Stepless Dimmer: By pressing the brightness ,you can easily adjust the brightness from 10% to 100%. 3 color temperature options - 3000K / 4000K / 6500K - meet your different lighting needs.Stable Bracket Saves Space: Fixed to a flat surface with a thickness of no more than 2 inches, saving space on the table, countertop or desk. When the arm is attached, it stays stable. It will not bend when adjusting the angle.Height-Adjustable Swivel Arm: The lamp head can be rotated 220°, 350° up and down, and the long arm can be extended from 35cm to 70cm.Professional eye protection: Made of diffused light-transmitting material, it has daytime lighting function; it emits soft light without ghosting, glare or flickering.